A current sensing device

Abstract

The invention discloses a current sensing apparatus for detecting lead current. The current sensing apparatus is characterized by comprising at least two sensors with a fixed spacing distance and a control unit, wherein each sensor comprises at least one sending unit; the sensing units are composed of magnetic sensing elements; the sensors are disposed at different positions along the diameter radiation direction of a lead to be detected; and the control unit is used for power supply and data processing. According to the invention, multiple sensors with fixed spacing distances are introduced for detecting a magnetic field generated by the current of a lead, and the current size of the lead is calculated according to detected different magnetic field intensity values. Therefore, compared to a conventional current detection method, the current sending apparatus has the advantages of high sensitivity, high measuring precision, good temperature characteristics, small size, high anti-interference capability and convenient use.

Description

technical field [0001] The invention relates to the technical field of current sensors, in particular to a magnetic current sensor. Background technique [0002] Current measuring devices generally measure current through the magnetic field generated by the measured current. Magnetic current sensors with Hall elements and magnetoresistive elements as sensitive elements have higher accuracy than optical fiber and coil current sensors. and sensitivity, and can be used in oily and extreme temperature environments. The Hall current sensor is the most widely used current sensing device at present. It uses the Hall effect principle to measure the field strength of the energized wire to obtain the magnitude of the current. The Hall element has a wide measurement range, but its sensitivity and accuracy are very low. The current sensor with the Er element as the sensitive element needs to set up an additional magneto-gathering ring structure, which is very large, and the magnetoresi...

AI Technical Summary

Problems solved by technology

Inductive measurement is that there is a wire in the current sensor, the current to be measured is introduced into this wire, and then the sensing unit located near it measures the magnitude of the magnetic field around the wire to obtain the magnitude of the current, but this measurement method is not convenient to use

The non-contact sensor is to bring the sensor close to the conductor to be measured, and then measure the magnitude of the magnetic field around the wire to obtain the current magnitude. At present, the commonly used non-contact current sensors all use a Hall element as the measurement unit of the sensitive element, but the magnetic field The distribution is related to the distance of the wire, so it is difficult to accurately measure the magnitude of the current only by one sensing unit

[0004] With the development of modern industry, the requirements for the accuracy, sensitivity, high and low temperature characteristics, anti-interference ability and ease of use of current measurement are getting higher and higher. It is not difficult to see that the existing current sensors cannot meet the requirements.

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